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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a080fb99108f30540c906c801d26053454b43c14386b06fdee8f195ce3d587' 
  AND token = 'BexK5dTViaNF/ZWD3np23jwHL8A6N3Lx/+84B/r1ycg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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