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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415c75d8ff106ed793481abb8cbfc29b93aedba5bfd3934038c433aad4b1a013' 
  AND token = 'jZM1nc7D+H0xxm0NJHl2Zh3b7yB8dp3pfZcw+AqIPwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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