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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1d1c58bda2f6a7948d0d9a8e0e5f8a71579166d1b3a33ef4148feb9b2abad8' 
  AND token = '4unYEqNZMKKv4x2zTsxocSmMa/tnCnDy5QyCeD622Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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