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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b55c4cc898cf6e9316e973600006d3606a54039a67bf9ef91358c5842e8ecd' 
  AND token = 'bT43IoHjTFhhM96Wf1btz0fi+ckinHGLB9b6E4240S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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