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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40e612a25c7fbd8336ac1755747276894d54b539b3bc8aec17dc914d5745b8c' 
  AND token = 'Kg0WgDOAYqIEzhMGAJ9A8iE06nC2dgqbogNzmvtyiUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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