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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7b1708c2957d0a5189aa4b1c8619631df95db0118e36bfbd6af411a44f12e8' 
  AND token = 'ZD98ElCp6+ZgNxSgxHt2XIu9hLZrlgmsROaBfhx5TZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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