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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683ad647ec613858d9b92a6d301b6b589b9ee977657f26ece9950da1cb44d879' 
  AND token = 'mI8bVp9rZL6kAxlnTLFS6lgOFNvKkoSPHv/MatGrB54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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