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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d95f0b348513cbd2418cb486c13b9d8cc42c7843c4efb2ec92b6af62bf3ddcc' 
  AND token = 'yjRnNedL6JYy3bgj7gtWSCfGnPFsaIPZKb/LZMK3K5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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