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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19109015726b1215537716658347a33df6b0605a0e68de844182d231a445f9a2' 
  AND token = 'SENpA7Mc0Iuf6vPG2FIE1oa8dUWd1ZBz50FPUTor0zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00133

JSON explain

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