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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732d2218d470f245e4bf550477240961bf54b4d34864d66fbf78d4d22d0e691a' 
  AND token = 'qoFTGxP/jTyUmAi+zIaejaY7F4ydYNOvOhiyDrsnvtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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