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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626f5757b960b2fa43e3465efb295784606df15236f316f71103921501c6da95' 
  AND token = 'x6/j0/KH+cIxnsam6hUzQhHhbmKE085A5O65X/kLIMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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