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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b091ca1c7983ec006f8a38afe15392e5b025fcc14f08465a8eae38fc8ff11b' 
  AND token = 'xO2cMos4lXbjLppObYFq9j/OWfcL1txdVwgsRO7rbog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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