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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5908b440f15050ed8d32416e18519aa06ce20a2b8888465f0ff12bce7b00ac99' 
  AND token = 'L87Ifcv2N2v68sgBSEkSBhhtPZW3hNYydACgkLfw0ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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