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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e25cb186673dc86b030926c1716265f0ea633c4481a1f08ab9d5c0c39e6228' 
  AND token = '533Yh91yP5DPjfM+gzGpYD8XcwQ+mW1SzKepCbDIfp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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