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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c41be31a477c1c8b11687bfeff229308f1ff171c982d4c33da44e2902ffb73d' 
  AND token = 'kiJ4wm8+osjej4VrjdPDIFZsoxF6EPChHAgxxHAJKLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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