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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a2562825d87fbe31958f454a8aafcb9cf65534b0039d35e3dedb259c07dd49' 
  AND token = '94jOkCxhIx7/MGt3GU4pDgiySNTuMv2i6RBnSZ4CZu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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