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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a99462793bef4239f5cbdc8f703fae214bd9ff71a3180bbb406e931d938553' 
  AND token = '99hQNz5nnz+L0i+mOqhqHxl5ijqsiLMm7NnUt4S10Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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