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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67de3395c806bc12a0a79ad3abbcd6997ed0634311c58842544511579d5f3d50' 
  AND token = 'LW+gz1Kg6xYvPiOLmOS4LRojy50p4KA+KZN39PI7Z4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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