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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8e6681f90a3bcb076a962c7f5ccef6f37d13f4791cff6df3bf06668ca14ee8' 
  AND token = 'gd0eMvXYF5wUme52fXeNacvRpZLPlSMB150TApa+DZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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