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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4aeb726f4f23b8a69439ab7044930b7dcad3020ff81b2f612b76fce952c6c17' 
  AND token = 'wEf3Rsofc1Pb2oIwin3z3ARkyyE/vJ6aaA6zJHM99RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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