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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90acd6b82487b5cb6f417059b96c088d76fede6a0a7035761f3026d3d795e8df' 
  AND token = 'pSf13RKw4G7T8GKNcwVBRX9SQJZ5ZP92x0qhe5alNKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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