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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855e0934ff4d8a829fc5912257aed384ae70d8450d97d8f8bb2c17417de9288b' 
  AND token = 'KMZW9+kk0Qy5Gkog/hcbog/qj8rvihiRR8VTiF2QF2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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