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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a3bc9e681380b4e6b519e0345f0b7f5f7a31a2f17a7f08c3787891015eff56' 
  AND token = 'xTzRk4YYVyXoITZ8BoQh3BYy9qW/Pz3U79EFRd6zo7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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