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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2662e3a695ca9ac496d57b4850de68931263e0b9110a22e7dd84ea477c91feb' 
  AND token = 'ayoJWMH8cQ/ymG0NePPPl9z4D36aOISRIY5PWj1WtuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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