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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f482674ccbd959bf8e326af8be64677c87fdcb3b5fcf4fcacc2d17332c32ec' 
  AND token = 'tXeyMOlMVf3d+jqnCcPkh4U98b1G3kcQ4TJ0rKWJHME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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