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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a0f5851e503f2ed5c83153782959103c84c1375277cd256e71206e9e8074ea' 
  AND token = '5XqgDgwT5l6iCwMpeIOeOjJUxNXExg5YE2hkGheRa1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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