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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b75f4fdab6fff34dc6d11235aeb57f838ad42fc03f76054bf486e2eca3882a' 
  AND token = '2eP0gK482bByU/HJPKZSzW/2S5NF9UMGKJM603AB6L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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