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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5139d68c99071ba422cdf69192f1d4433bc477bdaf47bd9054e9acc63cd123f9' 
  AND token = 'krqa2chj/0/kGm4lZVhRoZqcrXzWbv5z1QobRLLOYyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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