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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08965549378e3d1e6e5c763f9ee4a3b5bcb76528fc169ecac090e85fccaef8c' 
  AND token = '70imYRpqBT1ZZIQ0lCUfWqeVe5ObEUQ7B5Y67Zj1bKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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