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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f7590f047014f00bd9171c4be5e7469dc9c328f247a1e484ce661129e448d5' 
  AND token = 'MlD6RFrscujKXxUE3mpeTpAXfzPctz8no3BxhlPXrHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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