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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cbdf4290be069bddf840bf6079d55d431463efb9b6ada293df6461c1e0fdba4' 
  AND token = '2iUr+iAwk/3D8diGEfc8GjaH3Vsvmj3bPFucdcdo32M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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