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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9723071ed2909c2dd3db771a3d31e6e9c5782d1d6f26c1061aa8cbcf5514e4' 
  AND token = '9WUlS9hseJsxRDC5IyHuBu5uetohj0u8pTtxzvI6aNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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