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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58054ac0f6c65c598d69339e02b165a065bb6d4ef502685aa24540d4fd95d82e' 
  AND token = 'NEugFGSOE+rTD6xiBjttPfgTu930ABUWwLN3eBCGEmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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