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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c375b3987faacb235a9d23de969fd9e6e3abb326ce085e85aa25c3e9774c2d' 
  AND token = 'Ug+16HgOI99jyQkeb0IAeUVEbLMrGuc50Flk5kdEXjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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