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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d716c52abcc7471e52cf84fffdec5d1d7611e2cdcaf7cb043d809c01351fa2' 
  AND token = '58Ej839Yz7HiXTxyAnZxZ2XBT6k0G2ofUpsUpa3VN9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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