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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3541b3efdf978fb8c46d6facb91b98672719e349e95cbed8645b3bef27c32381' 
  AND token = 'EknBBK+l2tPgaEh6QcsBdi0aK/0PVfBze+BMOH63Hyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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