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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e88be1253297722977544e92fb1bc2d47e7837217b13bffe7496f6bb656038' 
  AND token = '2Ro91UjSIidKpfg+eO2/WBD+01kOC4G60CrBh7QkXws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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