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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d854ac704bee971dc05f290910aa736b2a44581770a7a1fe3a6c1ec16d63cc' 
  AND token = 'fPukqNJhRY0HqOVUdPucdu3mujllFgNbMKMk/JDlaXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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