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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19fe3d6ac13b19e3494612ea01b5af82b5e33dcd6d39a78cbbaedc0cdabd9a0e' 
  AND token = 'htiyNlpBlBZ+G1TBJPLJHMsK7aq3pJG6CjH08RusawM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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