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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c77d390470c307550b19ad6ba73b3c53c801fd6d1182f243d0ca4b4ea33f0cb' 
  AND token = 'MW6deMBe1gu21d+G1vx88lt7ZMoAp7rEs1Gha8GUbpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}