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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc17200bb53deb9c01ff50bf89ac9fe7be67e031318ffe71b5c58e7d52f49778' 
  AND token = 'vzq8RbscSw36qU4+6ud18klTyicoYKOwLchij/nSj3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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