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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af1f3ae8a0be9cd741cb541dbac7f9d84d10e253fc3fe3f469f16e99eaf261c' 
  AND token = 'KnTn/EtB2PQLuFONA5/kTqHxWR5Mf2wSEd7ZKRow314=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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