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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc0819b679c267595e61971a5b7418056bb0bffac1d3975f0654135e3cb320e' 
  AND token = 'nsrCWZVCkWY3jZlG/V/rsWW0sj9bydKacm3sq74FWeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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