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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2634da635aa22986af8de6a7c846cd50c5d692bc435b9493559055a19f4dcfe' 
  AND token = 'NcOHWYiEGcoDn9vjuc9Fk/w1pY+FmX0Qb4+HNlBzeZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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