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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b74d6a79f0186c42664fee6acc849eef9aa55b14e2322bcf55a72e07993b616' 
  AND token = '8h5EIXb1+ZV9saBFeS3i9Ouxavrsj8CfFCgAW81LNpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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