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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30797e85458192a5ea8c1b655d054ea190c9e0a0d99e9c22ffba72c0c2dd4b6a' 
  AND token = 'MHKBlULnKuqdysgyyOEKW9T1/317WehFPnAc526xMa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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