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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcda03687ee43025acb1d1b433244e77a130d2c1b4676c944bcece513905acd4' 
  AND token = 'zbbnAExs1WbrZ7hceYMP2acIXdIKPmvZVG+23rYkwOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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