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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdaee999c8990a9b88f0fadb28a958f48673b8e92fcdaf0f203ecdafc29495b5' 
  AND token = 'XC3w9ZdelOH4s9KWJAltKODmM92iLHwy/atWKN1TIxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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