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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19124a0fefa4487a9b84deec43de2be8413d9ac760d4a4b7d1063180f0235fdc' 
  AND token = 'n22nvsloOys18KHuy9p1bP3/f/0W0f+zmzvjxa4TaZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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