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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14c1af3d4357a89be08ecfe429e3020c5c4e708d4b253d082ceab28285887df' 
  AND token = 'mzc54pp/UFNovTu3JoACFXis9fLMRgz9FHpjcxA6mkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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