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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0556a77d3bbec4bc7c3a1033ce3768faea69a419c7585fc28f374ab0d0c00cf' 
  AND token = 'kFY2n3Fg71MjHQvVVyYtH19p0u0E9+854PTy9bIPh48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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